Scale



Sept. 2 1924.

H.B.BAGG

S CALI Filed Aug. 7, 1918 Patented Sept. 2, 1924.

UNITED STATESA PATENT OFFICE.

HOLLISV B. IBAGG, OF WATERTOWN, CONNECTICUT. .ASSIGNOR- T0 SCOVILL MAITUFAC- TUBING COMPANY, CORPORATION 0F CONNECTICUT.

SCALE.

Application led August 7, 1.918. -Serial No. 248,679.

To all whom t may concern.' f

Be it known t-hat I, HOLLIS B. Baco, a 'citizen of the United States, residing at IVatertown, county of Litchfield, and State of Connecticut, have invented certain new and useful Improvements in Scales, fully` described and represented in the following specification and the accompanying drawings forming a partl of the same.

This invention relates to certain improvements in scales.

In the type of scale in which the beam is supported on what is known as the pillar cap, that is, a cross-bar mounted either on one or two pillars, the shelf lever is ordinarily hung in a loop. In such scales. the beam may be supported either in a stand or in a loop. In! either case, during the weighing operation, the shelf lever due to the method of supporting it, is liable to sway to such an extent that the connections from the shelf lever to the scale lever system or from the shelf lever to the beam are moved out of the. vertical, and serious errors in weighing are liable to result.

Further, it has been usual to employ in connection with the beam and sliding poise a spring pressed detent to hold the poise in position. The beamshave been notched either on their upper or lower sides, but in both cases. the detent commercially emploved has consisted of a V-shaped block, the angularly disposed faces of the block when in locking position fitting the angulariy disposed faces of the notches. Such detent construction for holding the poise is objectionable, because it requires a positive release which must be operated to permit the sliding movement of the poise, and is further objectionable because, if any dirt collects in a notch or notches, the detent vwill not itruly engage the notches, with thev result thaty the poise is notaccurately positioned on ythe beam. While the actual variation of the poise from the true position may be slight, this may cause considerable error in determining the weight.

The present invention has for one of'its objects to produce an improved construction of scale byv which the connections between the shelf lever and beam and the shelf lever and the lever system of the scale are maintained vertical during weighing.

A further object of the invention is to produce animproved detent mechanism for the poise which will enable the poise to be always accurately set and easily released without the employment of special release mechanism.

Tit-h these and other objects not. specifically referred to in view, the invention consists in certain constructions and in certain parts, improvements and combinations as will be hereinafter fully described and then specifically set forth.

In the accompanying drawings- Figurel is a side elevation of so much of a scale embodying the invention as is necessary to an understanding thereof.

Figure 2 is a detail view. on a large scale, partly in section, illustrating the construction of an improved self-adjusting bearing which is employed in connection with the knife edge pivot.

Figure 3 is a section on of Figure 2.

` Figures 4, 5 and 6 are detail views illustrating the improved detent construction for holding the poise in position.

Figure 7 illustrates a modified construction of the self-adjusting bearing.

Referring to said drawings, l indicates the pillar cap, this cap. as illustrated, being supported on two pillars 2. In the conv struction shown, the beam is pivoted in a stand the movements of the beam being controlled by the usual trig loop 4 mounted on a trig loop stand.

According to the present invention. tho shelf lever instead of being mounted in a, loop so that it may have a swinging movement which would tend'fto throw the connections with the beam and lever system out of line, is so mounted that, during weighing, the connections are'maintained vertical. While this may be accomplished inv various ways, in the particular construction illustrated, the pillars 2 carry a shelf 5 on which issupported a `rigid shelf lever stand 6. Theshelf lever 7 yis pivoted to the stand and is connected to the beam by connections 8 of usual form, the connections from the shelf lever to the lever system of the scale beingindicated at- 9.

' While the pivotal connections by which the beam is mounted in the beam stand 3 the line 3 3 andthe shelf lever is mounted in the shelf lever stand 6 may be varied, it is preferred to employ self-adjusting bearings for this purpose. To obtain the best results, selfadjusting Vbearingsshould -be 'used both :for pivotally mounting the shelf lever and for pivotally mounting the beam, but `ifit 4is de sired to employ a self-adjusting bearing in only one of these places, it should be used for the pivotal connection between the beam and the beam stand. lVhile the character `of self-adjusting bearing may be varied, in the construction illustrated,the particular vbearing employed is that illustrated in Figs. 2 and 3. 'In 'this construction, which Villustrates the lbeam bearing, the rear l'end of the beam 10 is provided with a knife vedge pivot 11 extending from both sides of the'be'am. The base for lthe bearing is formed bv pro-Y viding the beam stand with a fork the ends of the. fork terminating in bases 12. As

illustrated, the bearing sup-port includes av pair yof blocks 13 which rest on the bases 12 and are provided with recesses 14; in which the pivot "11 rests, the best results being attained when these recesses are V-shaped, as

i. respect to the base to attain the desired results may be varied, as illustrated, the blocks 13 are 'connect-ed to. the bases 12 by means of pivots 15, this construction allowing the swinging movement hereinbefore referred to. l v i f In the particular construction illustrated,

the rocking movement is had by roundingV Y vone ofthe meeting faces of the support or base;- In the construction illustrated in Fig.

2, the under Vfaces 16 of the blocks 13 are rounded, while in the construction. shown f in Fig. 7 the upper faces 17 of the bases 12 y are rounded. The same result is obtained by either construction, but the construction illustrated in Fig. '2 is regarded as preferable from a manufacturing standpoint. It will be observed that therounding is at the Vend portions only of the supporting blocks or'baSeS, and that the meeting faces of the sidewise movement whichV would tend to v bar out of its true position.

increase the-friction by throwing the vpivot It is also important m constructions of this character to prevent the sidewise shift `of the pivot lwith respect to the bearing, In

the construction shown, this is accomplished by closing the pivot recesses in the support by plates18 which are mounted on the supi v port itself and'which 'move with the sup- -fport. To prevent endwise shiftof'the pivot, it should be made long enough -so `that its ends will lie very close to the closing plates, and to .reduce the Yfriction vto .a minimum the rends ofthe `pivot should be beveled backfas shown at 25.

The scale is provided with the usual sliding poise 20 and that part of the beam with `which Athis poise 'co-,operatesis shown as notched on its under side, as at 19. While the improvements are 'not to be restricted v`to beams notched on the under side, this construction v'is regarded as preferable, vbecause there* is'le'ss tendency forthe notches to.A accumulate dirt than when the beam is notched on lthe upper side. l

The poise has the usual trolley rolls 21 'and is provided rwith a detent mechanism for holding i't 1in position. In constructions embodying "the inventionv the dete'n't mechanism employed will include a detent which has 'acurved surface, for engaging the sides of the notches, andin 'the best constructions, this curved surface will be, as shown, a roll 22.' The roll, "as shown, is mounted on a leaf spring 23 secured to the poise, 'the poise being chambered out, Vas indicated at 24, to give the detent room to work. A deten'tV con struction, such as described, has the advantage ythat no release mechanism is necessary, as 'the roll will readily disengage itself from a' notch when the poise is pushed in either direction. Further, by Vemploying a curved surface the engaging 'contact with the notch is limited to a small part ofthe sides, so that if dirt accumulates in the bottom 'of the notch, the poise will beaccurately positioned notwithstanding this fact. Further, when Va roll is employed, asin the constructionillustr'ated, not only is wear on thev detent avoided, because fresh engaging 'surfacesare being continually presented to the notch, but

if there is 'dirt on the sides of the notch, themovement of the roll into and out of the notch tends to disengage it.

It. will be understood that the invention is not to be conned to the particular constructions herein shown 'and described, but

vthat changes and variations' may be made therein without departing` from the invention. f

' What is claimed isz- `In a scale, the combination with the beam notched on its under side, .of a 'chambered poise slidable thereon, a plurality of trolley rolls mounted in the chamber Iof the poise to run on the top of the beam, yand a spring roll located in the chamber of the poise for engaging the sides of the' notches with-which thepoise cooperates to hold the poisein position. p Y

In testimony whereof, I have hereunto set my hand;

,HOLLIS n. Base. 

